Building against Gnome 3.24 stack fails

[982c80311320c1b]

When building granite 0.4.0.1 using the Gnome 3.24 Sdk [0], it fails with the following error message:

/run/build/granite/lib/Widgets/ContractorView.vala:184.27-184.28: error: Argument 1: Cannot pass value to reference or output parameter
             list.remove (it);
                          ^^

There are also a few warnings about methods that have been deprecated since 3.20.

[0] https://git.gnome.org/browse/gnome-sdk-images/tree/org.gnome.Sdk.json.in?h=gnome-3-24